I don't think he actually control's him,before he left the hollow said"Don't you ever forget...if you ever give me a chance,I'll drag you down and crush your skull,and one last warning.if you really wanna control my power,make sure you don't die before I show up again."so I think he will be coming back eventually...thats just my 2 cents on the situation.

Anyway... yeah, we know so little about the King, but... Aizen said that he wants to get into "heaven," and so I'm assuming that the King holds some sort of key or method to get into heaven... either that, or he's God himself.

And considering that various sources have stated that Bleach seems to be based off Buddhist mythology, with SS as "false heaven" and HM as "false hell," coupled with the fact that we've seen "true hell," it seems only logical that there should be a "true heaven." And it would seem strange for the King not to have some sort of connection to that heaven... so my guess is that the king's job is dealing w/ true heaven, and all the dealings of false heaven/SS he left to the SS guys.

I'm currently re-reading the Grimmjow vs Ichigo battle in Hueco Mundo....I just can't get it out of my head how awesome the battle is progressing! Moreover, I'm soooo excited about what Rukia and Inoue would think once Ichigo fully explained to them his Vizard abilities

well i find it that even ichigo can't control his hollow form fully tho even if he was to be in his hollow form once he falls to unconsciousness while staying alive his hollow self will keep looking for an opening to pop out and take control again if i'm right his hollow self is growing strong each time i think

^Topic under "Bleach Anime Discussion". The fight has not ended yet in the anime.

And yes. It seems as though Ichigo is quickly obtaining the power to maintain his hollow-mask on for a longer amount of time. I think it's rather because of how he is currently fighting, than because of his previous fights, because they both came and went pretty quickly compared to his 3rd fight against Grimmjow...